Variable-speed-transmission device



W. WENDERHOLD.

VARIABLE SPEED TRANSMISSION DEVICE.

APPLICATION FILED APR. 28, 1917.

1 ,329, 8167 Patented Feb. 3, 1920.

4 SHEETS-SHEET I.

I I l I i i I l M I I I I I F'z' .I. 3

W. WENDERHOLD.

VARIABLE SPEED TRANSMISSION DEVICE.

APPLICATION FILED APR. 28, I917.

4 SHEETS-SHEET 2.

INVENTOR.

W. WENDERHOLDL VARIABLE SPEED TRANSMISSION DEVICE.

APPLICATION FILED APR-2B, I912.

Patented Feb. 3, 1920.

4 SHEETSSHEET 3.

IN Vli/V TOR.

W. WENDERHOLD.

VARIABLE SPE ED TRANSMISSION DEVICE.

APPLICATION FILED APR.28, 1917.

Patented Feb. 3, 1920.

4 SHEETSSHEI 4.

INVE/V TOR.

UNITED s'rn'rns PgrENT OFFICE.

WILLIAM WENDERHOLD, OF NEW YORK, N. Y., ASSIGNOR TO GRIT PATENTSCORPORA- TION, A CORPORATION OF NEW YORK.

VARIABLE-SPEED-TRANSMISSION DEVICE.

To all whom it may concern:

Be it known that I, WILLIAM IVENDER- HOLD, a citizen of the UnitedStates, residing at New York city, in the county and State of'New York,have invented certain new and useful Improvements in Variable-Speed-Transmission Devices, of which the following is a clear, full, andexact description. 7

The object of this invention is to provide a device that will transmitrotary power without loss of power and enable the operator to change thenumber of rotations instantly.

Another object is to provide a variable speed device that has no endthrust against its support bearings.

Another object is to provide a device that will transmit speed undervariable ratio at variable speed where high power is essential.

Another object and feature of my invention is to operate the devicequickly and to secure and hold the speed desired and to engage anddisengage the driving source instantly without change of speed.

An often employed and well known principle is to have a disk and apulley. The disk is usually in contact on its side or annular surfacewith the periphery of a pulley, which is moved to and from the center ofthe disk, thereby varying the speed of the driven member. Thisuniversally employed device, wherever employed, has never given absolutesatisfaction, the fundamental mechanical error being the excess of greatpressure against all bearings, short life, slipping and loss of power.

My device completely eliminates the a'fore-mentioned faults in a simplemanner, and with mechanically perfect principles by employing two disks,the pressure of one being drawn through the other upon a thrust ballbearing, all entirely self-contained, and all pressure charging upon theperiphery of a pulley on opposite sides, thereby eliminating all endthrust upon the support bearings and providing a double grip upon theperiphery of the pulley.

Referring to the drawings:

Figure 1 is a horizontal cross-section through one type of my device;

Fig. 2 is a horizontal crosssection through another type;

Fig. 3 is a vertical cross-section;

Fig. at is a partial detail of Fig. 3;

Specification of Letters Patent.

'Application filed April 28, 1917.

Patented Feb. 3, 1920.

Serial No. 165,082.

Fig. 5 is a side elevation, partly in crosssection; a

Fig. 6 is a top view of the interior of my device. a i

As illustrated in the drawing, M is an electric motor upon the axis ofwhich motor is fastened a coupling A, part of which coupling is alsofastened upon shaft 1 of'my device, which is mounted in the supportcasing 2. Asliding pulley 3 is mounted upon shaft 1 and V driven therebyby means of a key at in the pulley 3 and a key-way or groove in shaft 1.3 is a friction drive material securely pressed and fastened upon pulley3. The friction disks 5 and 6 are in contact with the periphery of Sfanddriven thereby. The disk 5 is securely fastened to shaft 7. Disk 6 isloosely mounted and has a hole slightly larger than the shaft 7, so thatit is not in contact with the shaft. but the tubular extensions 6 aresupported by the casing 2, and form the only rigid bearing for disk 6.On one end of said tubular extension 6 of disk 6 is mounted a thrustball race 8. The other ball race 5) is mounted upon a sleeve 10, whichsleeve is slidably mounted upon shaft 7 by means of a key and keyway, ndis held securely in contact with the balls 11 by the compression spring12, adjustable by the knurled knot 13. The pressure exerted upon theball race constitutes the pressure of the two disks 5 and 6 upon thefriction drive members 3 and 3*. Since the disks do not thrust upon thecasing bearings and only upon member 3 the device runs as free andeasily as a belt, and by shifting the pulley 3 upon shaft 1 the speed ofshaft 7 is varied. Upon one end of shaft 7 I mount a pulley B from whichany machine or other device may be driven.

As shown in Fig. 2, I provide the same device with a gearing for highpower drives, since one disk revolves in the opposite direction. Iprovide a gear 14 on the tubular extension of disk 6 (which can be ofone piece with the gear 14). Another gear 15 takes the place of sleeve10, but is provided with a key, the same as sleeve 10. An idler gear 16is mounted between gears 14 and 15 and meshes therewith. The gear 16 ismounted upon spindle 17 (see Fig. 3) and supported by a floatin bearing18 so that the gear 16 can also follow any side motion of the gears 14and 15. Two thrust ball the index finger. be operated it must bedepressed thereby has a tubu lar extension 19 and on the end thereof aslotted bracket 21. The bracket 21 is engaged bypin 22 which is fastened1n the lever g The lever is mounted upon the lever shaft 23, which has aflat rectangular :Qlld extending into the slot of the shaft upon whichis mounted the graduated knob The notches 255011 the knob 25 are engagedby the lock member 26 forming Before the knob 25 ca n disengaging thelock member 26. By re volving the knob and the shafts 2-1 and 2 thelever 22willslide the parts 21, 19 and 19 upon the bar '20, therebyshifting the pulley 3 from or toward the center of disks 5 and (3 (thespring 27 pressing upon the ;collar- 2-8, which is fastened upon shaftit forces the shaft 2% and knob 25 upward tothe locked positionwheneverthe knob 25 is released after each operation thereof). The bar 20 isonly provided as an'additional support for the parts 21, 19 and 19.

The part 26 is mounted upon a tube 29, which tube is mounted upon ahub'extension ofthe upper part of easing 2.

' I shall now describe the operation of the part that will enable theoperator to cut off the driving power from the disk and also enable himto reenga-ge them again at the same speed position they were underbefore the disconnection took place: In the upper part of casing 2 thereis mounted revoluble lever 30, which is slightly longer than thedistance between the disks 5 and 6. lVhen the l'eveirBO is brought ina90 alinement with the disks 5 and 6 they then have been slightlypressed apart and they no longer are in contact with the pulleys 3 and3E}, and consequently they do not revolve any longer, and when thememberBO is brought out of contact with the disks then they will againtouch-the pulleyg and beurevolved and driven thereby; To operate themember 30 .1 providethat the-member 30 is extended through the casing 2and the tube 29 up -.to. and above member 26, and on this end drivingshaft and a variable speed shaft to be driven located at right anglesthereto, of a pulley mounted on said driving shaft, a disk secured tosaid driven shafta-nd bear ing against one peripheral edge of saidpulley, a second disk loosely mounted on said driven shaft, and bearingagainst the opposite peripheral. edge of pulley, a spring norn'iallytending to draw said disks toward Each other, means to adjust thetension of i said spring, means for moving said disks out of contactwith said pulley, and means for shifting said pulley on said drivingshaft.

2. The combination with constant speed driving shaft and a variablespeed shaft to be drivenlocated at right angles thereto, of a pulleymounted on said driving shaft, adisk secured to said driven shaft andbearing against one peripheral edge of said pulley, a second dis;loosely mounted on said driven shaft. and bearing against the oppositeperipheral edge of said pulley, means normally tendingto' draw saiddisks toward each other, means for moving said disks out of contact withsaid pulley, and means for shifting said pulley on said driving shaft,and means controlleo by the pulley shifting means for indicating thespeed of rotation of said driven shaft. H p

:3. The combination with a constant speed driving shaft and a variablespeed shaft to be driven, located at right angles thereto, of a pulleymounted on said driving shaft, a

disk secured to said driven shaft, and bearing againstone'peripheraledge. of said pulley, a second disk loosely anounted onsaid drivenshaft and bearing against the opposite peripheral edge ofsaid pulley, and means for normally tending to draw said disks, towardeach other, means for moving said disks out of contact, with saidpulley,and means for SlllftlllQj SiLl Cl pulley on said driving shaft, andmeans controlled bythe pulley shi ng means for indicating the speed ofrotation of. said driven shaft.

Signed atthe city of. N ew York, New York, this 27th 'dayof April, onethousand nine hundred and seventeen.

W L M; wnNDnRI-IoLn.

